Method and apparatus for processing a downlink shared channel
Embodiments include a method and apparatus for processing a downlink shared channel. In one embodiment, a Node-B includes circuitry configured to process control information for a user equipment (UE) and to produce an N bit cyclic redundancy check (CRC) associated with the control information. The Node-B includes circuitry configured to modulo 2 add the N bit CRC with an N bit UE identity to produce an N bit field, wherein the UE identity is any one of a plurality of UE identities associated with the UE. The Node-B includes circuitry configured to transmit a wireless signal of a control channel, wherein the wireless signal comprises the N bit field and the control information.
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This application claims priority to and is a continuation of U.S. patent application Ser. No. 13/711,501, filed Dec. 11, 2012, which is a continuation of U.S. patent application Ser. No. 13/285,831, filed Oct. 31, 2011, which issued as U.S. Pat. No. 8,347,177, on Jan. 1, 2013, which is a continuation of U.S. patent application Ser. No. 12/862,561, filed Aug. 24, 2010, which issued as U.S. Pat. No. 8,051,360, on Nov. 1, 2011, which is a continuation of U.S. patent application Ser. No. 11/129,850, filed May 16, 2005, which issued as U.S. Pat. No. 7,783,953, on Aug. 24, 2010, which is a continuation of U.S. patent application Ser. No. 10/035,771, filed Dec. 26, 2001, which issued as U.S. Pat. No. 6,915,473, on Jul. 5, 2005, which claims the benefit of U.S. Provisional Patent Application Nos. 60/290,740, filed May 14, 2001; 60/314,993, filed Aug. 24, 2001; and 60/345,358, filed Oct. 25, 2001, which are incorporated by reference as if fully set forth herein.
BACKGROUNDThe present invention relates to the field of wireless communications. One of the applications of the present invention is directed to a downlink signaling approach employing a modified cyclic redundancy check for both data protection and unique/group UE identification.
Wireless communication systems have become an integral link in today's modern telecommunications infrastructure. As such, they have become increasingly relied upon not only to support voice communications, but also data communications. Voice communications are relatively low-rate, symmetrical in the upstream and downstream bandwidths and are predictable in the amount of bandwidth required.
However, data communications can place severe burdens upon a telecommunication system, particularly a wireless telecommunication system. First, data communications can often require extremely high data rates. Second, the amount of bandwidth for a data related application can vary greatly from several kilohertz of bandwidth to several megahertz. Third, the amount of bandwidth in the upstream and downstream directions can be drastically different. For example, with a typical Internet browsing application, very little data is sent in the upstream direction while vast amounts of data are downloaded in the downstream direction. These factors can place severe constraints upon a wireless telecommunication system.
The Wideband CDMA (WCDMA) standard, as the leading global third generation (3G) (IMT-2000) standard, supports data rates up to 2, Mb/s in indoor/small-cell-outdoor environments and up to 384, kb/switch wide-area coverage, as well as support for both high-rate packet data and high-rate circuit-switched data. However to satisfy the future demands for packet-data services, there is a need for a substantial increase in this data rate, especially in the downlink. High speed downlink packet access (HSDPA) would allow WCDMA to support downlink peak data rates in the range of approximately 8-10, Mb/s for best-effort packet-data services. This rate is far beyond the IMT-2000, requirement of 2, Mb/s. It also enhances the packet-data capability in terms of lower delay and improved capacity.
One solution for supporting data communications is the allocation of dedicated channels to each user equipment (UE). However, this results in an extremely inefficient use of the bandwidth since such channels often remain idle for long durations.
An alternative to dedicated channels for each UE is the use of the high speed shared data channels and the packeting of data. In this method, a plurality of high speed data channels are shared between a plurality of UEs. Those UEs having data for transmission or reception are dynamically assigned one of the shared data channels. This results in a much more efficient use of the spectrum.
One such process for assigning a high speed shared data channel when a base station has data waiting for transmission to a particular UE is shown in
If data at the base station is ready for transmission to the UE, a High Speed Downlink Shared Channel (HS-DSCH) indicator (HI) is transmitted in the associated DPCH. The HI has n-bit length, which points to one of 2n, SCCH-HSs shown in
For the example shown in
The process as described with reference to
There are several prior art methods for signaling the UE ID between the base station and the UE. Referring to
Another prior art technique shown in
A method and apparatus is disclosed wherein a user equipment (UE) receives control information on a first channel and uses the control information to process a second channel.
The presently preferred embodiments are described below with reference to the drawing figures wherein like numerals represent like elements throughout.
Referring to
Referring to
The system 100 receives the data field 102 and inputs the data from the data field 102 into the CRC generator 104. The CRC generator 104 generates the CRC field 106 and outputs the CRC from the CRC field 106 to a first input of the modulo 2 adder 110. The UE ID from the UE ID field 108 is output to the second input to the modulo 2, adder 110. The CRC and UE ID are then modulo 2, added to create a mask 112.
Preferably, the number of bits of the UE ID field 108 (M bits) is the same as the number of bits of the CRC field 106 (N bits). If M=N, then the UE ID may be directly modulo 2, added to the CRC as shown in
Referring to
Referring to
Preferably, the number of bits of the UE ID from the UE ID field 208 (M bits) is the same as the size of the CRC generator 204, although this is not necessary. If the size of the UE ID (M-bits) is less than the size of the CRC generator 204, then the UE ID may be padded with either leading zeros or trailing zeros to be equal in length to the size of the CRC generator 204. Alternatively, the value in the UE ID field 208 may be loaded to initialize the CRC generator 204, and any bit positions not filled by the UE ID would be zero. If the size of the UE ID (M bits) is greater than the size of the CRC generator 204, then the least significant bits are truncated from the UE ID in order to fit the UE ID to CRC generator 204. The truncated UE ID is then used to initialize the CRC generator 204.
Referring to
This second embodiment of the present invention utilizing implicit UE ID presents a simplistic, yet robust, alternative since it does not require assembly and disassembly of the UE ID with the SCCH-HS, at the transmitter or the receiver, as required by UE-specific CRC methods of the prior art and the first embodiment.
Referring to
In this embodiment, the number of bits of the UE ID field 408A (M bits) must be the same as the number of bits of the data field 402 in order to perform the modulo 2, addition. If the M is equal to X, then the UE ID from the UE ID field 408A may be directly modulo 2, added to the data from the data field 402. Due to the length of the data field 402, it is not expected that M will be greater than X. However, if thus were to occur, then the least significant bits are truncated from the UE ID field 408A until the length of the UE ID hold is equal to X. The truncated UE ID is then modulo 2 added to the value from the data field 402.
Due to the length X of the data field 302, it is not expected that M will be greater than X. However, if this were to occur, then the least significant M−X bits are truncated from the value in UE ID field 308A. The truncated UE ID is then modulo 2 added to the data from the data field 302.
Referring to
Referring to
Referring to
In this embodiment, the number of bits of the UE ID field 408A (M bits) must be the same as the number of bits of the data field 402 in order to perform the modulo 2, addition. If the M is equal to X, then the UE ID from the UE ID field 408A may be directly modulo 2, added to the data from the data field 402. Due to the length of the data field 302, it is not expected that M will be greater than X. However, if this were to occur, then the least significant bits are truncated from the UE ID field 408A until the length of the UE ID field is equal to X. The truncated UE ID is the modulo 2 added to the value from the data field 402.
If the length of the UE ID is shorter than the data field 402, then a “composite UE ID” is created such that the value from the UE ID field 408A is equal to X. The composite UE ID is created by repeating the UE ID as many times as it will fit within an X-bit field, then filling in the remaining trailing bits with a truncated UE ID. This is represented in the UE ID field 408A in
Referring to
Referring to
It should be noted that all of the above-described embodiments can be used to support multiple identities (IDs). A UE may be required to process messages addressed at several levels: 1) the UE's unique ID. 2) an ID corresponding in a subset or group of UEs, where the UE belongs to the subset; or 3) a broadcast (global ID) corresponding to all UEs in the system. For example, as shown in
To support this requirement, the transmitter generates the CRC as described above with each of the embodiments. At the receiver, the UE processes the message and generates the expected CRC, without the ID-based modification. The UE processor then modulo 2, adds the received CRC to the calculated CRC. The resultant output is the transmitted ID, which can be any one of the IDs described above. If the ID is none of these, then the UE discards the transmission.
In accordance with the present invention, using the CRC code of the length N, the undetected error probability on the identified SCCH-HS approaches 2−n. Using a 24-bit CRC to protect data transmitted on HS-DSCH, a 16-bit CRC to protect control information transmitted on SCCH-HS, and assuming 10−3, false acceptance probability of HI bits by an unintended UE, the embodiments in accordance with the present invention hereinbefore described will provide the probability of the false acceptances as follows:
Pfa=PfaHI×PfaH×PSD Equation (1)
where Pfa, is the probability of a false acceptance; PfaHI is the probability of a false acceptance of HI; PfaH is the probability of a false acceptance of SCCH-HS; and PSD, is the probability of a successful detection of HS-DSCH (PSD).
Using the above identified values for the present example with Equation (1):
Pfs=10−3×2−16×2−24=9.1×10−16
The reliability computation indicates that for the same length CRC, the probability of a user passing erroneous data up to a higher layer, will be extremely low.
Referring to
It should be noted that step 6 in
The present invention has the advantage of eliminating separate processing steps for the UE ID and the CRC. When the two fields are combined as hereinbefore described, the UE will not further process any message until both the CRC and the UE ID (or other type of ID shown in
While the present invention has been described in terms of the preferred embodiment, other variations, which are within the scope of the invention, as outlined in the claims below will be apparent to those skilled in the art.
Claims
1. A Node-B comprising:
- circuitry configured to process control information for a user equipment (UE) and to produce an N-bit cyclic redundancy check (CRC) associated with the control information;
- circuitry configured to module 2 add the N-bit CRC with an N-bit UE identity to produce an N-bit field, wherein the UE identity is any one of a plurality of UE identities associated with the UE; and
- circuitry configured to transmit a wireless signal of a control channel, wherein the wireless signal comprises the N-bit field and the control information.
2. The Node B of claim 1, wherein the circuitry configured to transmit the wireless signal is further configured to transmit on any one of a plurality of control channels.
3. The Node B of claim 1, wherein at least one of the plurality of UE identities of the UE is unique to the UE.
4. The Node B of claim 1, wherein at least one of the plurality of UE identities of the UE is an identity assigned to the UE.
5. The Node B of claim 4, wherein the identity assigned to the UE is unique within a subset of UEs operating in a wireless network.
6. The Node B of claim 1, wherein at least one of the plurality of UE identities of the UE identifies a group of UEs belonging to a plurality of subsets of UEs operating in a wireless network.
7. The Node B of claim 1, wherein at least one of the plurality of UE identities of the UE identifies a subset of UEs operating in a wireless network.
8. A user equipment (UE) comprising:
- circuitry configured to receive a wireless signal from a control channel, wherein the wireless signal comprises an N-bit field and control information and the N-bit field comprises a cyclic redundancy check (CRC) modulo masked with a UE identity (ID);
- circuitry to determine whether the CRC and UE ID are correct; and
- circuitry to transmit data indicating whether CRC and UE ID of the received wireless signal are correct.
9. The UE of claim 8, wherein the UE comprises a wide-band code division multiple access (W-CDMA) UE.
10. The UE of claim 8, wherein the CRC comprises a different number of bits than the UE ID.
11. The UE of claim 8, wherein the CRC comprises the same number of bits as the UE ID.
12. The UE of claim 8, wherein the circuitry to determine whether the CRC and UE ID are correct is included in a medium access control (MAC) layer circuitry.
13. The UE of claim 8, further comprising:
- circuitry to discard the received wireless signal if the CRC is incorrect.
14. A base station comprising:
- circuitry for generating a wireless signal comprising an N-bit field and control information, wherein the N-bit field comprises a cyclic redundancy check (CRC) modulo masked with a user equipment (UE) identity (ID);
- transmission circuitry to transmit the wireless signal via a control channel to a UE; and
- circuitry for receiving data indicating whether CRC and UE ID of the transmitted wireless signal are correct.
15. The base station of claim 14, wherein the CRC comprises a different number of bits than the UE ID.
16. The base station of claim 14, wherein the CRC comprises the same number of bits as the UE ID.
17. The base station of claim 14, further comprising:
- physical layer circuitry to calculate the CRC.
18. The base station of claim 14, further comprising:
- medium access control (MAC) layer circuitry to generate the control information.
19. The base station of claim 14, wherein the wireless signal is transmitted as a data burst.
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Type: Grant
Filed: Dec 23, 2013
Date of Patent: May 5, 2015
Patent Publication Number: 20140185546
Assignee: Intel Corporation (Santa Clara, CA)
Inventors: Nader Bolourchi (Elizabeth, NJ), Stephen E. Terry (Northport, NY), Stephen G. Dick (Nesconset, NY)
Primary Examiner: Fritz Alphonse
Application Number: 14/139,037
International Classification: H03M 13/00 (20060101); H04L 5/00 (20060101); H03M 13/09 (20060101); H03M 13/37 (20060101); H04L 1/00 (20060101); H04W 72/04 (20090101);